In which type of device does current lag voltage?

Current lagging voltage is a phenomenon that occurs in inductive devices, making this the correct answer. In inductive circuits, when an alternating current (AC) flows through an inductor, such as a coil or a transformer, the magnetic field buildup introduces a delay in the current relative to the voltage waveform. This delay means that the peak current occurs after the peak voltage, resulting in the current lagging behind the voltage.

In contrast, capacitive devices are characterized by current leading the voltage. In resistive devices, such as simple heating elements or incandescent bulbs, current and voltage are in phase, meaning they reach their peaks simultaneously. Transformers, while they operate on inductive principles, simply transfer electrical energy between circuits and are not explicitly categorized as devices where current lags voltage in the same way a pure inductor does. Therefore, inductive devices are the clear example of current lagging behind voltage.